[Laughter and tears: specific behaviors of humans].

Ethology is connected with attachment, deprivation experiment, territorial stress by animals, then by humans. Ethopsychiatry attends, among other things, to classic clinical approach in ethological perspective, to ethopharmacology, with animal models of depression and anxiety. It is interesting to include the theme of laugh and crying in human ethology, as a specific human like behaviour. Interest for animal and human suffering participates to medical act. Most of studies about crying were focused on human specificity of emotional (psychogenic) tears. Laughter as a specific human phenomenon is the best remedy against stress, also to give pleasure to your self and to other people (Acta....